Which two issues are root causes for the problem?

When troubleshooting a user complaint, you notice that two routers failed to establish an OSPF neighbor adjacency.

Which two issues are root causes for the problem? (Choose two)
A . The two routers are using the same router ID
B . The two routers are configured with the same area ID
C . OSPF is configured on the primary network of the neighbor, but not on the secondary network
D . The passive-interface command is configured on the connected interfaces
E . The two routers are configured with different process IDs

Answer: B D